KR100488956B1 - Apparatus for liquid crystal display and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a liquid crystal display device and a manufacturing method thereof, comprising the steps of: providing a transparent insulating substrate; Forming a black matrix on the substrate; Forming red, green, and blue color filters in each sub-pixel defined by the black matrix; Forming an overcoating layer on the color filters and the black matrix; Forming a strut spacer having a groove formed at the center of each side of the sub-pixel surrounding the four sides of each of the sub-pixels on which the red, green, and blue color filters are formed on the overcoating layer; And forming a liquid crystal layer composed of a polymer dispersion liquid crystal on the overcoating layer including the post spacer.

Description

Liquid crystal display and its manufacturing method {APPARATUS FOR LIQUID CRYSTAL DISPLAY AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a liquid crystal display device and a manufacturing method thereof, and more particularly, to a liquid crystal display device and a method for manufacturing the same by changing the structure of the strut spacer to improve the screen quality.

The color substrate of the liquid crystal display according to the related art having a strut spacer currently used, as shown in FIG. 1, forms a black matrix 3 on the glass substrate 1 and has R, G, B color filters. (5) is formed, an overcoating layer is formed, an ITO layer is formed, and then a post spacer is formed by applying, exposing and developing a photoresist. Here, the ITO layer is perpendicular to the TN mode or the like. It is formed in the mode using an electric field, but not in the mode using a horizontal electric field such as FFS or IPS.

However, in the liquid crystal display device having the strut spacer according to the related art manufactured as described above, if the gap between the patterned strut spacer is too long and the size is small, the breakage or defect of the strut spacer occurs at a certain portion of the cell gap (cell) of the portion. gap) is different from the cell gap of other parts. There was a problem that such a difference in cell gap was caused to appear stained on the panel.

Conventionally, to solve this problem, as shown in FIG. 2, a method of forming the strut spacer 17 in the entire area on the black matrix 13 formed on the substrate 10 has been proposed. At this time, as shown in (B) and (C) of FIG. 2, the formation position of the strut spacer 17 could be changed in consideration of the rubbing direction and the liquid crystal injection hole direction.

However, the liquid crystal display and the manufacturing method according to the prior art had the following problems.

In the prior art, even if the strut spacer is designed in one direction according to the process progression direction in the PI coating or rubbing process, the area of the strut spacer is so large that it may cause scratches or coating defects due to steps during the process. There was this. In addition, there is a problem in that the liquid crystal flow is not easy because it is blocked by the strut spacer in at least one direction during the liquid crystal injection.

Accordingly, an object of the present invention is to provide a liquid crystal display device and a manufacturing method using a strut spacer capable of smoothly flowing liquid crystal.

In addition, another object of the present invention is to provide a liquid crystal display device and a method of manufacturing the same that can prevent PI coating defects and scratches.

According to an aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, the method including: providing a transparent insulating substrate; Forming a black matrix on the substrate; Forming red, green, and blue color filters in each sub-pixel defined by the black matrix; Forming an overcoating layer on the color filters and the black matrix; Forming a strut spacer having a groove formed at the center of each side of the sub-pixel surrounding the four sides of each of the sub-pixels on which the red, green, and blue color filters are formed on the overcoating layer; And forming a liquid crystal layer composed of a polymer dispersion liquid crystal on the overcoating layer including the post spacer.

Liquid crystal display device according to the present invention, a transparent insulating substrate; A black matrix formed on the substrate; Red, green, and blue color filters formed in sub-pixels defined by the black matrix; An overcoat layer formed on the color filters and the black matrix; A post spacer formed on the overcoating layer and having a groove formed at the center of each side surrounding four sides of each sub pixel on which the red, green, and blue color filters are formed; And a liquid crystal layer composed of a polymer dispersion liquid crystal formed on a substrate product including the post spacer.

In addition, the manufacturing method of the liquid crystal display device according to the present invention comprises the steps of providing a transparent insulating substrate; Forming a black matrix on the substrate; Forming red, green, and blue color filters in each sub-pixel defined by the black matrix; Forming an overcoating layer on the black matrix and the color filter layer; Applying a photosensitive polymer having an orientation function on the overcoating layer; Halftone exposing the photosensitive polymer to form an alignment layer on each subpixel and to form a relatively thick strut spacer on the black matrix; And forming a liquid crystal layer on the substrate product including the post spacers serving as the alignment layer.

In addition, the liquid crystal display device according to the present invention, a transparent insulating substrate; A black matrix formed on the substrate; Red, green, and blue color filters within each sub-pixel defined by the black matrix; An overcoat layer formed on the black matrix and the color filter layer; A photosensitive polymer formed on the overcoating layer and having an orientation function; A strut spacer having a relatively thick thickness on the black matrix while forming an alignment layer on each subpixel by halftone exposure of the photosensitive polymer; And a liquid crystal layer formed on the substrate product including the strut spacer serving as the alignment layer.

Hereinafter, a liquid crystal display and a manufacturing method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a plan view illustrating a liquid crystal display device and a method of manufacturing the same according to Embodiment 1 of the present invention, and FIGS. 4A to 4C are lines A-A ', B-B', and C-C 'of FIG. 3. 5 is a cross-sectional view illustrating a driving principle of a PDLC in a liquid crystal display device and a method of manufacturing the same according to Embodiment 1 of the present invention, and FIG. 6 is a liquid crystal according to Embodiment 2 of the present invention. It is sectional drawing for demonstrating a display apparatus and its manufacturing method.

In the method of manufacturing a liquid crystal display device according to Embodiment 1 of the present invention, a black matrix 110 is formed of resin or chromium (Cr) on a transparent insulating substrate 100 such as glass, and then the black The red filter 120a, the green filter 120b, and the blue filter 120c are formed in each subpixel defined by the matrix 110.

Next, an overcoat layer 130 is formed on the entire surface of the substrate including the color filter layer 120 and the black matrix 110. In this case, an ITO layer is formed on the overcoating layer 130 when the LCD is manufactured in a mode using a vertical electric field such as a TN mode. On the other hand, the ITO layer is not formed when manufacturing a liquid crystal display device in a mode using a horizontal electric field such as FFS or IPS mode.

Subsequently, a photoresist is formed on the overcoating layer 130, and then the photoresist is exposed using a patterned mask to form a strut spacer 140. The strut spacer 140 is about 2 to 10 μm. Form to thickness.

Here, as shown in FIG. 3, the post spacer 140 includes the sub filter when each of the red filter 120a, the green filter 120b, and the blue filter 120c is a sub pixel. The groove 111 is formed in the center of each side of the pixel while surrounding the four sides of the pixel. Reference numeral 120 denotes a color filter layer.

In this case, the upper surface structure of the substrate 100 is similar to the shape of the groove 111 having a predetermined size in the center of the four sides of one sub-pixel, the portion of the groove 111 of each side is the post spacer 140 Is a portion where no groove is formed, and in this case, the length of the groove 111 is in a range not exceeding the size of the subpixel at 1 μm. 4A to 4C are cross-sectional views taken along the lines A-A ', BB' and C-C 'of FIG. 3, and as shown, a black matrix 110 is formed on the transparent insulating substrate 100, and the black A red filter 120a, a green filter 120b, and a blue filter 120c are formed in each of the subpixel regions defined in the matrix, and are formed on the color filters 120a, 120b, 120c and the black matrix 110. The overcoat layer 130 is formed, and the support spacer 140 having the groove 111 is formed on the overcoat layer 130.

Subsequently, although not shown, a liquid crystal layer is formed on the entire surface of the color filter substrate 100 as described above, and then bonded to another separate substrate, that is, an array substrate provided with a TFT and an ITO layer, which are switching elements, and Thus, the liquid crystal display device of the present invention is formed. In this case, it is preferable that the overcoating layer is formed on the substrate including the TFT to flatten the entire substrate so that the color filter substrate having a large holding spacer area can be easily coped with.

As the liquid crystal layer, a polymer dispersed liquid crystal (PDLC) in which a polymer and a liquid crystal are dispersed and mixed is used. In this case, it is possible to prevent PI coating defects or stretches that may be caused by steps during the subsequent PI (polyimide) coating process or rubbing process. The polymer dispersion liquid crystal (PDLC) is because the polymer and the liquid crystal are mixed in a constant ratio, so that the liquid crystal can be aligned and driven without the PI coating and alignment treatment.

In addition, it is preferable to use a one drop filling (ODF) method when forming the liquid crystal layer to smoothly flow the liquid crystal, thereby forming a uniform cell gap. In addition, since the support spacer is formed over a large area and has grooves on each of four sides surrounding the sub-pixels, the liquid crystal flows easily.

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In the liquid crystal display of the present invention configured as described above, as shown in FIG. 5, light is scattered when no voltage is applied (A), but an image is not realized when a voltage is applied (B). The liquid crystals 82 in the 80 are arranged in an orderly manner in a specific direction according to the electric field so that light may be transmitted upward to implement a constant image.

On the other hand, the manufacturing method of the liquid crystal display device according to the second embodiment of the present invention, as shown in Figure 6, on the transparent insulating substrate 200, such as glass using a black matrix (Cr) or the like 210 is formed, and a color filter layer 220 including red 220a, green 220b, and blue 220c layers is formed with the black matrix 210 therebetween.

Subsequently, an overcoat layer 230 is formed on the black matrix 210 and the color filter layer 220. Next, an ITO layer (not shown) is formed on the overcoating layer 230 in a mode using a vertical electric field, whereas the same ITO layer is not formed in a mode using a horizontal electric field.

Next, a photosensitive polymer having an alignment layer function is coated on the transparent conductive film 230, and then the post spacer 240 is formed by performing an exposure process with a half tone mask 250. The post spacer 240 also serves as an alignment layer and an overcoating layer in view of material properties.

Since other processes are the same as the manufacturing method of the liquid crystal display according to the first embodiment of the present invention, the detailed description thereof will be omitted.

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Various embodiments can be easily implemented as well as self-explanatory to those skilled in the art without departing from the principles and spirit of the present invention. Accordingly, the claims appended hereto are not limited to those already described above, and the following claims are intended to cover all of the novel and patented matters inherent in the invention, and are also common in the art to which the invention pertains. Includes all features that are processed evenly by the knowledgeable.

As described above, the liquid crystal display according to the present invention and the manufacturing method thereof have the following effects.

In the present invention, the flow of the liquid crystal can be facilitated by providing a groove in the support spacer while applying a support spacer having a uniform cell gap to a large area, and also applying a PI coating through the application of a polymer dispersed liquid crystal (PDLC). And rubbing defects can be prevented, and in addition, the liquid crystal injection time can be reduced by using the one-drop filling (ODF) technique. Accordingly, the present invention has the effect of improving the screen quality of the liquid crystal display device, reducing the number of manufacturing process steps and reducing the cost.

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1 and 2 are plan views illustrating a liquid crystal display and a method of manufacturing the same according to the related art.

3 is a plan view illustrating a liquid crystal display device and a method of manufacturing the same according to Embodiment 1 of the present invention;

4A to 4C are cross-sectional views taken along lines A-A ', B-B', and C-C 'of FIG. 3.

FIG. 5 is a cross-sectional view for explaining a driving principle of a PDLC in the liquid crystal display according to the first embodiment of the present invention and a method of manufacturing the same; FIG.

6 is a cross-sectional view for describing a liquid crystal display and a method of manufacturing the same according to Embodiment 2 of the present invention.

-Explanation of symbols for the main parts of the drawings-

100; Transparent insulating substrate 110; Black matrix

120; Color filter layer 130; Overcoating layer

140; Holding Spacer Pattern

Claims (17)

Providing a transparent insulating substrate; Forming a black matrix on the substrate; Forming red, green, and blue color filters in each sub-pixel defined by the black matrix; Forming an overcoating layer on the color filters and the black matrix; Forming a strut spacer having a groove formed at the center of each side of the sub-pixel surrounding the four sides of each of the sub-pixels on which the red, green, and blue color filters are formed on the overcoating layer; And And forming a liquid crystal layer composed of a polymer dispersed liquid crystal on the overcoating layer including the support spacers. delete The method of claim 1, And the grooves are formed to have a size of 1 μm to the sub pixel size. The method of claim 1, The support spacer is a manufacturing method of the liquid crystal display device, characterized in that formed in a height of 2㎛ 10㎛. The method of claim 1, The liquid crystal layer is a method of manufacturing a liquid crystal display device, characterized in that formed by one-drop filling method. Transparent insulating substrates; A black matrix formed on the substrate; Red, green, and blue color filters formed in sub-pixels defined by the black matrix; An overcoat layer formed on the color filters and the black matrix; A post spacer formed on the overcoating layer and having a groove formed at the center of each side surrounding four sides of each sub pixel on which the red, green, and blue color filters are formed; And And a liquid crystal layer composed of a polymer dispersion liquid crystal formed on a substrate product including the post spacer. delete The method of claim 6, And the groove is formed to have a size of 1 μm to the sub pixel size. The method of claim 6, The support spacer is liquid crystal display, characterized in that formed in a height of 2㎛ to 10㎛. Providing a transparent insulating substrate; Forming a black matrix on the substrate; Forming red, green, and blue color filters in each sub-pixel defined by the black matrix; Forming an overcoating layer on the black matrix and the color filter layer; Applying a photosensitive polymer having an orientation function on the overcoating layer; Halftone exposing the photosensitive polymer to form an alignment layer on each subpixel and to form a relatively thick strut spacer on the black matrix; And And forming a liquid crystal layer on the substrate resultant substrate including the post spacers serving as the alignment layer. delete delete The method of claim 10, The support spacer is a manufacturing method of the liquid crystal display device, characterized in that formed in a height of 2㎛ 10㎛. The method of claim 10, The liquid crystal layer is a method of manufacturing a liquid crystal display device, characterized in that formed by one-drop filling method. Transparent insulating substrates; A black matrix formed on the substrate; Red, green, and blue color filters within each sub-pixel defined by the black matrix; An overcoat layer formed on the black matrix and the color filter layer; A photosensitive polymer formed on the overcoating layer and having an orientation function; A strut spacer having a relatively thick thickness on the black matrix while forming an alignment layer on each subpixel by halftone exposure of the photosensitive polymer; And And a liquid crystal layer formed on the substrate product including the strut spacer that also serves as the alignment layer. delete The method of claim 15, The support spacer is liquid crystal display, characterized in that formed in a height of 2㎛ to 10㎛.